I was at a local gun store where they just received a shipment of the SD 9 and 40. They also have Sigma's as well. The manager and I shoot silhouette together and I asked John if the magazines were interchangeable. He said, let's find out.....SD fits a Sigma and locks the slide back and vice versa. So one first impression it appears that the in fact do interchange. Anyone else have the same experience?
Randy

None taken, Lee. The essential reason to change or modify the OEM Sigma plate is because it protrudes beyond the contour of the grip when in the gun; and it creates unnecessary square corners when carrying spare mags in the belt, back pocket etc.

Actually my wife noticed the square OEM baseplate corners when shooting my 40VE for the first time. I noticed them the first time I packed it IWB under a tail-out T-Shirt. Dang things gouged into my Tender Vittles Storage Unit.

Those of us who still ascribe to the 'smooth gun' concept find the OEM Sigma floorplate detestable.